College of Mining, Liaoning Technical University, Fuxin, 123000, China.
Shandong Province Research Institute of Coal Geology Planning and Exploration, Jinan, 250104, China.
Sci Rep. 2023 Mar 13;13(1):4136. doi: 10.1038/s41598-023-31170-1.
To determine the main factors influencing dynamic pressure and large deformation roadways, a targeted set of support technologies was designed. The 2603 air inlet roadway of the Zhangcun coal mine in Lu'an, Shanxi Province, was taken as an example. The influence of the Wenwangshan South normal fault and in situ stress field on the dynamic pressure roadway was analyzed theoretically, and the main factors influencing this dynamic pressure and large deformation roadway under natural geological conditions were determined. The effect of the existing roadway support scheme was evaluated by field test methods such as nondestructive bolt testing. The influence of mining two working faces on the dynamic pressure and large deformation roadway was studied by the FLAC3D numerical simulation method. On this basis, a new grouting material was developed, a complete set of technical schemes of full-section integrated cooperative support of dynamic pressure and large deformation roadways was proposed, and the field application effect was verified. The results showed that under natural geological conditions, the 2603 air inlet roadway was located within the influence range of the Wenwangshan South normal fault, which was significantly affected and controlled by the fault. The included angle between the roadway extension direction and the maximum principal stress was 74°, which was not conducive to the stability of the roadway. The range of the roadway loose zone was large. Under the existing support conditions, the surrounding rock could not form a relatively stable structure, which was one of the main reasons for the large deformation of the surrounding rock in the dynamic pressure roadway. The 2603 air inlet roadway was affected by the mining of both the adjacent working face and the 2603 working face. The stresses were superimposed, and the roadway was greatly deformed and damaged. A new grouting material was developed. A crosslinking agent prepared by toluene diisocyanate and polyether polyol was added to the existing polyurethane material to form a new grouting material, and a complete supporting technical scheme was proposed. The field application results showed that the displacement and floor heave of both sides of the roadway were reduced by approximately 87%, the deformation and failure of the coal and rock mass of the roadway were effectively controlled, and the deformation of the dynamic pressure roadway was greatly reduced.
为了确定影响动压及大变形巷道的主要因素，设计了有针对性的支护技术。以山西省潞安漳村煤矿 2603 进风巷为工程背景，采用理论分析的方法研究了王文山南正断层和地应力场对动压巷道的影响，确定了在自然地质条件下影响该动压及大变形巷道的主要因素。采用无损锚杆检测等现场测试方法对现有巷道支护方案的效果进行了评价，采用 FLAC3D 数值模拟方法研究了开采两个工作面对动压及大变形巷道的影响。在此基础上，研制了一种新型注浆材料，提出了完整的动压及大变形巷道全断面综合协同支护技术方案，并进行了现场应用验证。结果表明，在自然地质条件下，2603 进风巷位于王文山南正断层影响范围内，受断层影响和控制明显。巷道延伸方向与最大主应力之间的夹角为 74°，不利于巷道的稳定性。巷道松动范围较大。在现有支护条件下，围岩不能形成较为稳定的结构，这是动压巷道围岩大变形的主要原因之一。2603 进风巷受相邻工作面和 2603 工作面开采的影响，应力叠加，巷道变形破坏严重。研制了一种新型注浆材料，在现有的聚氨酯材料中加入甲苯二异氰酸酯和聚醚多元醇制备的交联剂，形成了一种新型注浆材料，并提出了完整的支护技术方案。现场应用结果表明，巷道两帮位移和底鼓量减少了约 87%，有效控制了煤岩体的变形和破坏，大大降低了动压巷道的变形。
